76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
//===-- CSKYISelDAGToDAG.cpp - A dag to dag inst selector for CSKY---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an instruction selector for the CSKY target.
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//
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//===----------------------------------------------------------------------===//
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#include "CSKY.h"
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#include "CSKYSubtarget.h"
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#include "CSKYTargetMachine.h"
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#include "MCTargetDesc/CSKYMCTargetDesc.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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using namespace llvm;
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#define DEBUG_TYPE "csky-isel"
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namespace {
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class CSKYDAGToDAGISel : public SelectionDAGISel {
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const CSKYSubtarget *Subtarget;
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public:
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explicit CSKYDAGToDAGISel(CSKYTargetMachine &TM) : SelectionDAGISel(TM) {}
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StringRef getPassName() const override {
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return "CSKY DAG->DAG Pattern Instruction Selection";
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}
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bool runOnMachineFunction(MachineFunction &MF) override {
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// Reset the subtarget each time through.
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Subtarget = &MF.getSubtarget<CSKYSubtarget>();
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SelectionDAGISel::runOnMachineFunction(MF);
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return true;
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}
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void Select(SDNode *N) override;
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#include "CSKYGenDAGISel.inc"
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};
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} // namespace
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void CSKYDAGToDAGISel::Select(SDNode *N) {
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// If we have a custom node, we have already selected
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if (N->isMachineOpcode()) {
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LLVM_DEBUG(dbgs() << "== "; N->dump(CurDAG); dbgs() << "\n");
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N->setNodeId(-1);
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return;
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}
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SDLoc Dl(N);
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unsigned Opcode = N->getOpcode();
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bool IsSelected = false;
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switch (Opcode) {
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default:
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break;
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// FIXME: Add selection nodes needed later.
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}
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if (IsSelected)
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return;
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// Select the default instruction.
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SelectCode(N);
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}
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FunctionPass *llvm::createCSKYISelDag(CSKYTargetMachine &TM) {
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return new CSKYDAGToDAGISel(TM);
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}
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